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            <blockquote>
<p>python哈希算法hashlib-md5</p>
</blockquote>
<p>今天遇到个加密key是用的python写的，这里简单记录一下语法。</p>
<ul>
<li>基本使用</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">import hashlib         #导入hashlib模块</span><br><span class="line">md = hashlib.md5()     #获取一个md5加密算法对象</span><br><span class="line">md.update(&apos;how to use md5 in hashlib?&apos;.encode(&apos;utf-8&apos;))#制定需要加密的字符串</span><br><span class="line">print(md.hexdigest())  #获取加密后的16进制字符串 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line">因为hashlib是对二进制进行加密的，如果直接对字符串加密的话， 会报错的。</span><br><span class="line">因此需要通过encode将字符串转码成二进制格式。</span><br></pre></td></tr></table></figure>

          
        
      
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            <blockquote>
<p>SpringBoot设置允许跨域请求</p>
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">package com.highset.common.config;</span><br><span class="line"></span><br><span class="line">import org.springframework.context.annotation.Bean;</span><br><span class="line">import org.springframework.context.annotation.Configuration;</span><br><span class="line">import org.springframework.web.cors.CorsConfiguration;</span><br><span class="line">import org.springframework.web.cors.UrlBasedCorsConfigurationSource;</span><br><span class="line">import org.springframework.web.filter.CorsFilter;</span><br><span class="line"></span><br><span class="line">@Configuration</span><br><span class="line">public class CorsConfig &#123;</span><br><span class="line">    private CorsConfiguration buildConfig() &#123;</span><br><span class="line">        CorsConfiguration corsConfiguration = new CorsConfiguration();</span><br><span class="line">        corsConfiguration.addAllowedOrigin(&quot;*&quot;); // 1允许任何域名使用</span><br><span class="line">        corsConfiguration.addAllowedHeader(&quot;*&quot;); // 2允许任何头</span><br><span class="line">        corsConfiguration.addAllowedMethod(&quot;*&quot;); // 3允许任何方法（post、get等）</span><br><span class="line">        return corsConfiguration;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Bean</span><br><span class="line">    public CorsFilter corsFilter() &#123;</span><br><span class="line">        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();</span><br><span class="line">        source.registerCorsConfiguration(&quot;/**&quot;, buildConfig()); // 4</span><br><span class="line">        return new CorsFilter(source);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
          
        
      
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            <blockquote>
<p>SpringBoot通过url访问获取外部静态资源图片</p>
</blockquote>
<p>因为Highset使用springboot的jar部署，对于上传的图片只能放在外部文件夹中，对外能够通过url访问图片。</p>
<h4 id="方法一-代码上配置-亲测好用"><a href="#方法一-代码上配置-亲测好用" class="headerlink" title="方法一: 代码上配置 亲测好用"></a>方法一: 代码上配置 亲测好用</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WebMvcConfiguration</span> <span class="keyword">extends</span> <span class="title">WebMvcConfigurerAdapter</span> </span>&#123;</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addResourceHandlers</span><span class="params">(ResourceHandlerRegistry registry)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//addResourceHandler是指你想在url请求的路径</span></span><br><span class="line">        <span class="comment">//addResourceLocations是图片存放的真实路径</span></span><br><span class="line">        registry.addResourceHandler(<span class="string">"/image/**"</span>).addResourceLocations(<span class="string">"file:D://User/"</span>);</span><br><span class="line">        <span class="keyword">super</span>.addResourceHandlers(registry);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>注意：自己的项目是否配置了shiro等权限拦截要将请求设为匿名可访问。</p>
<h4 id="方法二：配置文件中配置"><a href="#方法二：配置文件中配置" class="headerlink" title="方法二：配置文件中配置"></a>方法二：配置文件中配置</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">#资源映射路径为/image/**，你想在url访问的请求路径</span><br><span class="line">spring.mvc.<span class="keyword">static</span>-path-pattern=/image<span class="comment">/**</span></span><br><span class="line"><span class="comment">#资源映射地址为file:D://User/，图片存放的真实路径</span></span><br><span class="line"><span class="comment">spring.resources.static-locations=file:D://User/</span></span><br></pre></td></tr></table></figure>
<p>如下图，看浏览器的地址栏，框框标志第一部分是我的项目名，框框标志第二部分就是上面配置的映射路径（会映射到图片存放的真实路径），框框标志第三部分就是我的图片文件名，通过上面两种方式随便一种，就可以直接在浏览器通过url访问获取图片了。</p>
<p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20180412183307.png?11111" alt="image"></p>

          
        
      
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<p>Spring默认定时@Scheduled不支持L关键字</p>
</blockquote>
<p>每个月的最后一天10：15”执行定时任务，@Scheduled(cron = “0 15 10 L * ?”)，它在初始化Spring上下文时出现了错误：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Caused by: java.lang.IllegalStateException: Encountered invalid </span><br><span class="line">@Scheduled method &apos;execute&apos;: For input string: &quot;L&quot;</span><br><span class="line"></span><br><span class="line">原因是不支持L,W,C特殊字符</span><br></pre></td></tr></table></figure>
<ul>
<li>解决方案：</li>
</ul>
<p>首先，为每个可能的最后几天调用调度程序(28，29，30，31)。然后，在函数块内用if块检查这是否是最后一个日期。如果是，则执行预期的任务。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">@Scheduled(cron = &quot;0 15 10 28-31 * ?&quot;)</span><br><span class="line">public void execute() &#123;</span><br><span class="line">	final Calendar c = Calendar.getInstance();</span><br><span class="line">	if (c.get(Calendar.DATE) == c.getActualMaximum(Calendar.DATE)) &#123;</span><br><span class="line">		//是最后一天</span><br><span class="line">		System.out.println(&quot;信息员等级升降级。。。。&quot;);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>参考链接：<br><a href="https://stackoverflow.com/questions/54415868/spring-schedule-last-day-of-month-not-working" target="_blank" rel="noopener">https://stackoverflow.com/questions/54415868/spring-schedule-last-day-of-month-not-working</a><br><a href="https://stackoverflow.com/questions/31445395/cron-expression-is-not-working-for-last-day-of-the-month" target="_blank" rel="noopener">https://stackoverflow.com/questions/31445395/cron-expression-is-not-working-for-last-day-of-the-month</a><br><a href="https://stackoverflow.com/questions/18079289/workaround-for-cronsequencegenerator-last-day-of-month?noredirect=1&amp;lq=1" target="_blank" rel="noopener">https://stackoverflow.com/questions/18079289/workaround-for-cronsequencegenerator-last-day-of-month?noredirect=1&amp;lq=1</a></p>

          
        
      
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<p>Spring-Task定时任务的配置和使用</p>
</blockquote>
<h4 id="spring中使用定时任务"><a href="#spring中使用定时任务" class="headerlink" title="spring中使用定时任务"></a>spring中使用定时任务</h4><ul>
<li>1、基于xml配置文件使用定时任务</li>
</ul>
<p>首先配置spring开启定时任务</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">&lt;beans xmlns=&quot;http://www.springframework.org/schema/beans&quot;  </span><br><span class="line">    xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;   </span><br><span class="line">    xmlns:p=&quot;http://www.springframework.org/schema/p&quot;  </span><br><span class="line">    xmlns:task=&quot;http://www.springframework.org/schema/task&quot;  </span><br><span class="line">    xmlns:context=&quot;http://www.springframework.org/schema/context&quot;  </span><br><span class="line">    xmlns:aop=&quot;http://www.springframework.org/schema/aop&quot;   </span><br><span class="line">    xsi:schemaLocation=&quot;http://www.springframework.org/schema/beans   </span><br><span class="line">    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  </span><br><span class="line">    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd    </span><br><span class="line">    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd    </span><br><span class="line">    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd    </span><br><span class="line">    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd    </span><br><span class="line">    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd&quot;&gt;  </span><br><span class="line">  </span><br><span class="line">    &lt;task:annotation-driven /&gt; &lt;!-- 定时器开关--&gt;  </span><br><span class="line">  </span><br><span class="line">    &lt;bean id=&quot;myTask&quot; class=&quot;com.spring.task.MyTask&quot;&gt;&lt;/bean&gt;  </span><br><span class="line">  </span><br><span class="line">    &lt;task:scheduled-tasks&gt;  </span><br><span class="line">        &lt;!-- 这里表示的是每隔五秒执行一次 --&gt;  </span><br><span class="line">        &lt;task:scheduled ref=&quot;myTask&quot; method=&quot;show&quot; cron=&quot;*/5 * * * * ?&quot; /&gt;  </span><br><span class="line">        &lt;task:scheduled ref=&quot;myTask&quot; method=&quot;print&quot; cron=&quot;*/10 * * * * ?&quot;/&gt;  </span><br><span class="line">    &lt;/task:scheduled-tasks&gt;  </span><br><span class="line">      </span><br><span class="line">    &lt;!-- 自动扫描的包名 --&gt;</span><br><span class="line">    &lt;context:component-scan base-package=&quot;com.spring.task&quot; /&gt;  </span><br><span class="line">      </span><br><span class="line">&lt;/beans&gt;</span><br></pre></td></tr></table></figure>
<p>定义自己的任务执行逻辑</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">package com.spring.task;  </span><br><span class="line">  </span><br><span class="line">/** </span><br><span class="line"> * 定义任务 </span><br><span class="line"> */  </span><br><span class="line">public class MyTask &#123;  </span><br><span class="line">      </span><br><span class="line">    public void show() &#123;  </span><br><span class="line">        System.out.println(&quot;show method 1&quot;);  </span><br><span class="line">    &#125;  </span><br><span class="line">      </span><br><span class="line">    public void print() &#123;  </span><br><span class="line">        System.out.println(&quot;print method 1&quot;);  </span><br><span class="line">    &#125;  </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>2、基于注解使用定时任务(PS：这里我一直以为只有Springboot才能用这个，好尴尬啊)</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">package com.spring.task;  </span><br><span class="line">import org.springframework.scheduling.annotation.Scheduled;  </span><br><span class="line">import org.springframework.stereotype.Component;  </span><br><span class="line">  </span><br><span class="line">/**</span><br><span class="line"> * 基于注解的定时器  </span><br><span class="line"> */</span><br><span class="line">@Component</span><br><span class="line">public class MyTask2 &#123;  </span><br><span class="line"></span><br><span class="line">    /**</span><br><span class="line">     * 定时计算。每天凌晨 01:00 执行一次</span><br><span class="line">     */</span><br><span class="line">    @Scheduled(cron = &quot;0 0 1 * * *&quot;)</span><br><span class="line">    public void show() &#123;</span><br><span class="line">        System.out.println(&quot;show method 2&quot;);  </span><br><span class="line">    &#125;  </span><br><span class="line">      </span><br><span class="line">    /**</span><br><span class="line">     * 启动时执行一次，之后每隔2秒执行一次  </span><br><span class="line">     */</span><br><span class="line">    @Scheduled(fixedRate = 1000*2)   </span><br><span class="line">    public void print() &#123;  </span><br><span class="line">        System.out.println(&quot;print method 2&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h4 id="Spring-Boot中使用定时任务"><a href="#Spring-Boot中使用定时任务" class="headerlink" title="Spring Boot中使用定时任务"></a>Spring Boot中使用定时任务</h4><ul>
<li>1、引入springboot starter包</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;</span><br><span class="line">        &lt;artifactId&gt;spring-boot-starter&lt;/artifactId&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
<ul>
<li>2、在程序入口启动类添加@EnableScheduling，开启定时任务功能</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">@SpringBootApplication</span><br><span class="line">@EnableScheduling</span><br><span class="line">public class Application &#123;</span><br><span class="line"></span><br><span class="line">    public static void main(String[] args) &#123;</span><br><span class="line">        SpringApplication.run(Application.class, args);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>3、定义定时任务逻辑</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">@Component</span><br><span class="line">public class MyTask3 &#123;</span><br><span class="line"></span><br><span class="line">    private int count=0;</span><br><span class="line"></span><br><span class="line">    @Scheduled(cron=&quot;*/6 * * * * ?&quot;)</span><br><span class="line">    private void process() &#123;</span><br><span class="line">        System.out.println(&quot;this is scheduler task runing  &quot;+(count++));</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>@Scheduled 注解中可以传8种参数：</p>
<p>cron：指定cron表达式<br>zone：默认使用服务器默认时区。可以设置为java.util.TimeZone中的zoneId<br>fixedDelay：从上一个任务完成开始到下一个任务开始的间隔，单位毫秒<br>fixedDelayString：同上，时间值是String类型<br>fixedRate：从上一个任务开始到下一个任务开始的间隔，单位毫秒<br>fixedRateString：同上，时间值是String类型<br>initialDelay：任务首次执行延迟的时间，单位毫秒<br>initialDelayString：同上，时间值是String类型</p>
<h4 id="补充：cron表达式的使用方法"><a href="#补充：cron表达式的使用方法" class="headerlink" title="补充：cron表达式的使用方法"></a>补充：cron表达式的使用方法</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">Cron表达式是一个字符串，字符串以5或6个空格隔开，分为6或7个域，每一个域代表一个含义，Cron有如下两种语法格式：</span><br><span class="line"></span><br><span class="line">Seconds Minutes Hours DayofMonth Month DayofWeek Year</span><br><span class="line">Seconds Minutes Hours DayofMonth Month DayofWeek</span><br><span class="line"></span><br><span class="line">每一个域可出现的字符如下：</span><br><span class="line"></span><br><span class="line">Seconds: 可出现&quot;, - * /&quot;四个字符，有效范围为0-59的整数</span><br><span class="line">Minutes: 可出现&quot;, - * /&quot;四个字符，有效范围为0-59的整数</span><br><span class="line">Hours: 可出现&quot;, - * /&quot;四个字符，有效范围为0-23的整数</span><br><span class="line">DayofMonth: 可出现&quot;, - * / ? L W C&quot;八个字符，有效范围为0-31的整数</span><br><span class="line">Month: 可出现&quot;, - * /&quot;四个字符，有效范围为1-12的整数或JAN-DEC</span><br><span class="line">DayofWeek: 可出现&quot;, - * / ? L C #&quot;四个字符，有效范围为1-7的整数或SUN-SAT两个范围。1表示星期天，2表示星期一， 依次类推</span><br><span class="line">Year: 可出现&quot;, - * /&quot;四个字符，有效范围为1970-2099年</span><br><span class="line"></span><br><span class="line">每一个域都使用数字，但还可以出现如下特殊字符，它们的含义是：</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">*：表示匹配该域的任意值，假如在Minutes域使用*, 即表示每分钟都会触发事件。</span><br><span class="line"></span><br><span class="line">?：只能用在DayofMonth和DayofWeek两个域。它也匹配域的任意值，但实际不会。因为DayofMonth和 DayofWeek会相互影响。例如想在每月的20日触发调度，不管20日到底是星期几，则只能使用如下写法： 13 13 15 20 * ?, 其中最后一位只能用？，而不能使用，如果使用表示不管星期几都会触发，实际上并不是这样。</span><br><span class="line"></span><br><span class="line">-：表示范围，例如在Minutes域使用5-20，表示从5分到20分钟每分钟触发一次。</span><br><span class="line"></span><br><span class="line">/：表示起始时间开始触发，然后每隔固定时间触发一次，例如在Minutes域使用5/20,则意味着5分钟触发一次，而25，45等分别触发一次。</span><br><span class="line"></span><br><span class="line">,：表示列出枚举值值。例如：在Minutes域使用5,20，则意味着在5和20分每分钟触发一次。</span><br><span class="line"></span><br><span class="line">L：表示最后，只能出现在DayofWeek和DayofMonth域，如果在DayofWeek域使用5L,意味着在最后的一个星期四触发。</span><br><span class="line"></span><br><span class="line">W：表示有效工作日(周一到周五),只能出现在DayofMonth域，系统将在离指定日期的最近的有效工作日触发事件。例如：在 DayofMonth使用5W，如果5日是星期六，则将在最近的工作日：星期五，即4日触发。如果5日是星期天，则在6日(周一)触发；如果5日在星期一 到星期五中的一天，则就在5日触发。另外一点，W的最近寻找不会跨过月份。</span><br><span class="line"></span><br><span class="line">LW：这两个字符可以连用，表示在某个月最后一个工作日，即最后一个星期五。</span><br><span class="line"></span><br><span class="line">#：用于确定每个月第几个星期几，只能出现在DayofMonth域。例如在4#2，表示某月的第二个星期三。</span><br></pre></td></tr></table></figure>
          
        
      
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<p>Java多线程调用并获取返回值</p>
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<p>main1使用Future是最基本的方法，会造成阻塞，适合执行方法少、时间短的；<br>main2是功能比较强大的，使用了ExecutorCompletionService保存已经执行完的方法，适合执行不确定时间的需求。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line">import java.util.ArrayList;</span><br><span class="line">import java.util.List;</span><br><span class="line">import java.util.concurrent.Callable;</span><br><span class="line">import java.util.concurrent.CompletionService;</span><br><span class="line">import java.util.concurrent.ExecutionException;</span><br><span class="line">import java.util.concurrent.ExecutorCompletionService;</span><br><span class="line">import java.util.concurrent.ExecutorService;</span><br><span class="line">import java.util.concurrent.Executors;</span><br><span class="line">import java.util.concurrent.Future;</span><br><span class="line"></span><br><span class="line">public class TestCallable &#123;</span><br><span class="line"></span><br><span class="line">    public static void main1(String[] args) &#123;</span><br><span class="line">        ExecutorService executor = Executors.newFixedThreadPool(5);</span><br><span class="line">        try &#123;</span><br><span class="line">            List&lt;Future&lt;Integer&gt;&gt; list = new ArrayList&lt;&gt;();</span><br><span class="line">            for(int i = 0; i &lt; 10; i++) &#123;</span><br><span class="line">                list.add(executor.submit(new Task(i)));</span><br><span class="line">            &#125;</span><br><span class="line">            /**</span><br><span class="line">             * 用List保存Future</span><br><span class="line">             * 用get来获取返回结果，如果Future没有执行完，再调用get方法时就会阻塞</span><br><span class="line">             * 导致可能执行完的操作没有即时返回</span><br><span class="line">             */</span><br><span class="line">            for(Future&lt;Integer&gt; f : list) &#123;</span><br><span class="line">                int value = f.get();</span><br><span class="line">                System.out.println(value);</span><br><span class="line">            &#125;</span><br><span class="line">            </span><br><span class="line">        &#125; catch (InterruptedException | ExecutionException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        executor.shutdown();</span><br><span class="line">    &#125;</span><br><span class="line">    public static void main2(String[] args) &#123;</span><br><span class="line">        ExecutorService executor = Executors.newFixedThreadPool(5);</span><br><span class="line">        /**</span><br><span class="line">         * ExecutorCompletionService获取先执行完的任务返回值，这样就不会造成阻塞</span><br><span class="line">         */</span><br><span class="line">        CompletionService&lt;Integer&gt; completion = new ExecutorCompletionService&lt;&gt;(executor);</span><br><span class="line">        try &#123;</span><br><span class="line">            for(int i = 0; i &lt; 10; i++) &#123;</span><br><span class="line">                completion.submit(new Task(i));</span><br><span class="line">            &#125;</span><br><span class="line">            for(int i = 0 ; i &lt; 10; i++) &#123;</span><br><span class="line">                int ret = completion.take().get();</span><br><span class="line">                System.out.println(ret);</span><br><span class="line">            &#125;</span><br><span class="line">            </span><br><span class="line">        &#125; catch (InterruptedException | ExecutionException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        executor.shutdown();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">class Task implements Callable&lt;Integer&gt;&#123;</span><br><span class="line">    private int id;</span><br><span class="line">    public Task(int id) &#123;</span><br><span class="line">        this.id = id;</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    @Override</span><br><span class="line">    public Integer call() throws Exception &#123;</span><br><span class="line">        if(id%2==0)</span><br><span class="line">            Thread.sleep((long) (Math.random()*10000));</span><br><span class="line">         System.out.println(&quot;run task[&quot;+id+&quot;]&quot;);</span><br><span class="line">        return id;</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
          
        
      
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<p>npm install 使用国内镜像</p>
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<p>国内访问外网都很慢，甚至不能访问！大家都懂，都很无奈！<br>安装Node时自带的npm地址默认是：<a href="http://registry.npmjs.org" target="_blank" rel="noopener">http://registry.npmjs.org</a> ，npm install没反应！一般我们都会使用国内的镜像地址，来提高下载速度。</p>
<h4 id="国内镜像"><a href="#国内镜像" class="headerlink" title="国内镜像"></a>国内镜像</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cnpm镜像地址：http://registry.cnpmjs.org </span><br><span class="line">淘宝镜像地址：https://registry.npm.taobao.org</span><br></pre></td></tr></table></figure>
<h4 id="使用国内镜像有2种方法："><a href="#使用国内镜像有2种方法：" class="headerlink" title="使用国内镜像有2种方法："></a>使用国内镜像有2种方法：</h4><h5 id="一、直接修改镜像地址；"><a href="#一、直接修改镜像地址；" class="headerlink" title="一、直接修改镜像地址；"></a>一、直接修改镜像地址；</h5><p>1.npm config set key value 命令，设置指定的镜像地址</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">npm config set registry https://registry.npm.taobao.org </span><br><span class="line">npm info underscore （这个只是为了检验上面的设置命令是否成功，若成功，会返回[指定包]的信息）</span><br></pre></td></tr></table></figure>
<p>2.npm –registry命令</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">npm --registry https://registry.npm.taobao.org info underscore （npm info underscore依然是为了检验是否设置成功）</span><br></pre></td></tr></table></figure>
<p>3.修改配置文件~/.npmrc （win系统在C:\Users\用户名.npmrc） 加入下面内容</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">registry = https://registry.npm.taobao.org</span><br></pre></td></tr></table></figure>
<p>其实1,2，3都是修改npm的配置文件.npmrc .</p>
<h5 id="二、用封装好的cnpm命令"><a href="#二、用封装好的cnpm命令" class="headerlink" title="二、用封装好的cnpm命令"></a>二、用封装好的cnpm命令</h5><p>cnpm<br>如果觉得直接修改比较麻烦的话，就用cnpm命令吧，先用</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ npm install -g cnpm --registry=https://registry.npm.taobao.org</span><br></pre></td></tr></table></figure>
<p>安装cnpm包，然后就可以敲cnpm install [name]命令了，很方便~~</p>

          
        
      
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            <blockquote>
<p>Zookeeper核心概念及Java客户端的使用</p>
</blockquote>
<h4 id="一、Zookeeper核心概念"><a href="#一、Zookeeper核心概念" class="headerlink" title="一、Zookeeper核心概念"></a>一、Zookeeper核心概念</h4><h5 id="1-什么是znode？"><a href="#1-什么是znode？" class="headerlink" title="1.什么是znode？"></a>1.什么是znode？</h5><p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701002736.png" alt="image"></p>
<p>ZooKeeper操作和维护的为一个个数据节点，称为 znode，采用类似文件系统的层级树状结构进行管理。如果 znode 节点包含数据则存储为字节数组（byte array）。<br>创建 znode 时需要指定节点类型<br>znode 共有 4 种类型，分别为：持久（无序）、临时（无序）、持久有序和临时有序。</p>
<h5 id="2-节点的类型"><a href="#2-节点的类型" class="headerlink" title="2.节点的类型"></a>2.节点的类型</h5><p>2大类、四种类型 持久、临时、持久有序、临时有序<br>  PERSISTENT 持久类型，如果不手动删除 是一直存在的<br>PERSISTENT_SEQUENTIAL<br>  EPHEMERAL 临时 客户端session失效就会随着删除节点 没有子节点<br>EPHEMERAL_SEQUENTIAL 有序 自增 </p>
<p>Stat数据结构：</p>
<p>Stat中记录了这个 ZNode 的三个数据版本，分别是version（当前ZNode的版本）、cversion（当前ZNode子节点的版本）和 cversion（当前ZNode的ACL版本）。<br>Stat：状态信息、版本、权限相关</p>
<p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701003830.png" alt="image"></p>
<p>Session会话：<br>客户端来创建一个和zk服务端连接的句柄。<br>连接状态：CONNECTING\CONNECTED\CLOSED</p>
<h5 id="3-什么是watcher？"><a href="#3-什么是watcher？" class="headerlink" title="3.什么是watcher？"></a>3.什么是watcher？</h5><p>Watcher（事件监听器），是Zookeeper中的一个很重要的特性。Zookeeper允许用户在指定节点上注册一些Watcher，并且在一些特定事件触发的时候，ZooKeeper服务端会将事件通知到感兴趣的客户端上去，该机制是Zookeeper实现分布式协调服务的重要特性。</p>
<p><img src="https://zj820382480.gitee.io/youdaoyun/image/TIM截图20190701003638.png" alt="image"></p>
<h5 id="4-什么是ACL？"><a href="#4-什么是ACL？" class="headerlink" title="4.什么是ACL？"></a>4.什么是ACL？</h5><p>ACL(Access Control List)<br>内置的 ACL schemes：<br>world：默认方式，相当于全世界都能访问<br>auth：代表已经认证通过的用户(cli中可以通过addauth digest user:pwd 来添加当前上下文中的授权用户)<br>digest：即用户名:密码这种方式认证，这也是业务系统中最常用的<br>ip：使用Ip地址认证</p>
<p>ACL支持权限：<br>CREATE: 能创建子节点<br>READ：能获取节点数据和列出其子节点<br>WRITE: 能设置节点数据<br>DELETE: 能删除子节点<br>ADMIN: 能设置权限<br>高性能<br>ZooKeeper 是高性能的。 在“读”多于“写”的应用程序中尤其地高性能，因为“写”会导致所有的服务器间同步状态。（“读”多于“写”是协调服务的典型场景。）<br> 顺序访问<br>对于来自客户端的每个更新请求，ZooKeeper 都会分配一个全局唯一的递增编号，这个编号反应了所有事务操作的先后顺序，应用程序可以使用 ZooKeeper 这个特性来实现更高层次的同步原语。 这个编号也叫做时间戳——zxid（Zookeeper Transaction Id）</p>
<h4 id="二、Java客户端的使用"><a href="#二、Java客户端的使用" class="headerlink" title="二、Java客户端的使用"></a>二、Java客户端的使用</h4><h5 id="1-Zkclient"><a href="#1-Zkclient" class="headerlink" title="1.Zkclient"></a>1.Zkclient</h5><p>ZkClient是由Datameer的工程师开发的开源客户端，对Zookeeper的原生API进行了包装，实现了超时重连、Watcher反复注册等功能。<br>github源代码地址：<a href="https://github.com/sgroschupf/zkclient" target="_blank" rel="noopener">https://github.com/sgroschupf/zkclient</a></p>
<ul>
<li>添加maven依赖</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">     &lt;groupId&gt;org.apache.zookeeper&lt;/groupId&gt;</span><br><span class="line">     &lt;artifactId&gt;zookeeper&lt;/artifactId&gt;</span><br><span class="line">     &lt;version&gt;3.4.9&lt;/version&gt;</span><br><span class="line"> &lt;/dependency&gt;</span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;com.101tec&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;zkclient&lt;/artifactId&gt;</span><br><span class="line">    &lt;version&gt;0.10&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
<ul>
<li>zkclient使用</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">public ZkClient(String serverstring)</span><br><span class="line">public ZkClient(String zkServers, int connectionTimeout)</span><br><span class="line">public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout)</span><br><span class="line">public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout, ZkSerializer zkSerializer)</span><br><span class="line">public ZkClient(final String zkServers, final int sessionTimeout, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)</span><br><span class="line">public ZkClient(IZkConnection connection)</span><br><span class="line">public ZkClient(IZkConnection connection, int connectionTimeout)</span><br><span class="line">public ZkClient(IZkConnection zkConnection, int connectionTimeout, ZkSerializer zkSerializer)</span><br><span class="line">public ZkClient(final IZkConnection zkConnection, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)</span><br><span class="line">创建节点</span><br><span class="line">public void createPersistent(String path)</span><br><span class="line">public void createPersistent(String path, boolean createParents)</span><br><span class="line">public void createPersistent(String path, boolean createParents, List&lt;ACL&gt; acl)</span><br><span class="line">public void createPersistent(String path, Object data)</span><br><span class="line">public void createPersistent(String path, Object data, List&lt;ACL&gt; acl)</span><br><span class="line">public String createPersistentSequential(String path, Object data)</span><br><span class="line">public String createPersistentSequential(String path, Object data, List&lt;ACL&gt; acl) </span><br><span class="line">public void createEphemeral(final String path)</span><br><span class="line">public void createEphemeral(final String path, final List&lt;ACL&gt; acl)</span><br><span class="line">public String create(final String path, Object data, final CreateMode mode)</span><br><span class="line">public String create(final String path, Object data, final List&lt;ACL&gt; acl, final CreateMode mode) </span><br><span class="line">public void createEphemeral(final String path, final Object data)</span><br><span class="line">public void createEphemeral(final String path, final Object data, final List&lt;ACL&gt; acl)</span><br><span class="line">public String createEphemeralSequential(final String path, final Object data)</span><br><span class="line">public String createEphemeralSequential(final String path, final Object data, final List&lt;ACL&gt; acl)</span><br><span class="line">删除节点：</span><br><span class="line">public boolean delete(final String path)</span><br><span class="line">public boolean delete(final String path, final int version)</span><br><span class="line">public boolean deleteRecursive(String path)</span><br><span class="line">读取列表：</span><br><span class="line">public List&lt;String&gt; getChildren(String path)</span><br><span class="line">获取节点内容：</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path)</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path, boolean returnNullIfPathNotExists)</span><br><span class="line">public &lt;T extends Object&gt; T readData(String path, Stat stat)</span><br><span class="line">更新内容：</span><br><span class="line">public void writeData(String path, Object object)</span><br><span class="line">public void writeData(final String path, Object datat, final int expectedVersion)</span><br><span class="line">public Stat writeDataReturnStat(final String path, Object datat, final int expectedVersion)</span><br><span class="line"></span><br><span class="line">监测节点是否存在</span><br><span class="line">protected boolean exists(final String path, final boolean watch)</span><br><span class="line"></span><br><span class="line">注册监听</span><br><span class="line">接口类	注册监听方法	解除监听方法</span><br><span class="line">IZkChildListener	ZkClient的subscribeChildChanges方法	ZkClient的unsubscribeChildChanges方法</span><br><span class="line">IZkDataListener	ZkClient的subscribeDataChanges方法	ZkClient的subscribeChildChanges方法</span><br><span class="line">IZkStateListener	ZkClient的subscribeStateChanges方法	ZkClient的unsubscribeStateChanges方法</span><br><span class="line">其中ZkClient还提供了一个unsubscribeAll方法，来解除所有监听。</span><br></pre></td></tr></table></figure>
<h5 id="2-Curator"><a href="#2-Curator" class="headerlink" title="2.Curator"></a>2.Curator</h5><p>Curator 是 Netflix 公司开源的一个 Zookeeper 客户端，与 Zookeeper 提供的原生客户端<br>相比，Curator 的抽象层次更高，简化了 Zookeeper 客户端的开发量。现在已是 apache 的<br>顶级开源框架，Fluent 编程风格的实现。<br>官网:<a href="http://curator.apache.org" target="_blank" rel="noopener">http://curator.apache.org</a></p>
<ul>
<li>添加maven依赖</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--基础框架--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-framework&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--功能 jar 分布式锁、队列等--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-recipes&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt; </span><br><span class="line">	&lt;groupId&gt;org.apache.curator&lt;/groupId&gt; &lt;!--客户端重试策略--&gt;</span><br><span class="line">	&lt;artifactId&gt;curator-client&lt;/artifactId&gt;</span><br><span class="line">	&lt;version&gt;&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
<ul>
<li>使用:</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line">Curator 框架提供了一种流式接口,通过 builder 串起来，传递参数都是调方法。</span><br><span class="line">Curator 框架通过 CuratorFrameworkFactory 以工厂模式和 builder 模式创建</span><br><span class="line">CuratorFramework 实 例。 CuratorFramework 实例都是线程安全的，你应该在你的应用中</span><br><span class="line">共享同一个.</span><br><span class="line">工厂方法 newClient()提供了一个简单方式创建实例。 而 Builder 提供了更多的参数控制。</span><br><span class="line">一旦你创建了一个 CuratorFramework 实例，你必须调用它的 start()启动，在应用退出时调</span><br><span class="line">用 close()方法关闭.</span><br><span class="line">1.创建 Curator 连接实例</span><br><span class="line">String address = &quot;localhost:2181&quot;;</span><br><span class="line">CuratorFramework client = CuratorFrameworkFactory.newClient(address, new</span><br><span class="line">ExponentialBackoffRetry(1000, 3));//重试机制</span><br><span class="line">client.start();</span><br><span class="line"></span><br><span class="line">注意：一个 Zookeeper 集群只需要构造一个 CuratorFramework 实例对象即可。</span><br><span class="line">CuratorFramework 使用之前必须先调用client.start();</span><br><span class="line"></span><br><span class="line">CuratorFramework 提供的方法：</span><br><span class="line">方法名 描述</span><br><span class="line">create 开始创建操作， 可以调用额外的方法(比如方式 mode 或者后台执行 background) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">Delete 开始删除操作. 可以调用额外的方法(版本或者后台处理 version orbackground)并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">checkExists 开始检查 ZNode 是否存在的操作. 可以调用额外的方法(监控或者后台处理)并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">getData 开始获得 ZNode 节点数据的操作. 可以调用额外的方法(监控、后台处理或者获取状态 watch, background or get stat) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">setData 开始设置 ZNode 节点数据的操作. 可以调用额外的方法(版本或者后台处理) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">getChildren 开始获得 ZNode 的子节点列表。 以调用额外的方法(监控、后台处理或者获取状态 watch, background or get stat) 并在最后调用 forPath()指定要操作的 ZNode</span><br><span class="line">inTransaction 开始是原子 ZooKeeper 事务. 可以复合 create, setData, check, and/or</span><br><span class="line">delete 等操作然后调用 commit()作为一个原子操作提交</span><br><span class="line"></span><br><span class="line">事件类型以及事件的方法如下：</span><br><span class="line"></span><br><span class="line">EventType EventMethods</span><br><span class="line">CREATE getResultCode() and getPath()</span><br><span class="line">DELETE getResultCode() and getPath()</span><br><span class="line">EXISTS getResultCode(), getPath() and getStat()</span><br><span class="line">GETDATA getResultCode(), getPath(), getStat() andgetData()</span><br><span class="line">SETDATA getResultCode(), getPath() and getStat()</span><br><span class="line">CHILDREN getResultCode(), getPath(), getStat(),getChildren()</span><br><span class="line">WATCHED getWatchedEvent</span><br><span class="line"></span><br><span class="line">监听器</span><br><span class="line"></span><br><span class="line">Curator 提供了三种 Watcher(Cache)来监听结点的变化：</span><br><span class="line">Path Cache：监视一个路径下子结点的创建、删除，以及结点数据的更新。产生的</span><br><span class="line">事件会传递给注册的 PathChildrenCacheListener。</span><br><span class="line">Node Cache：监视一个结点的创建、更新、删除，并将结点的数据缓存在本地。</span><br><span class="line">Tree Cache：Path Cache 和 Node Cache 的“合体”，监视路径下的创建、更新、删</span><br><span class="line">除事件，并缓存路径下所有子结点的数据。</span><br><span class="line"></span><br><span class="line">重试机制</span><br><span class="line">Curator 内部实现的几种重试策略:</span><br><span class="line">1.ExponentialBackoffRetry:重试指定的次数, 且每一次重试之间停顿的时间逐渐增加.</span><br><span class="line">2.RetryNTimes:指定最大重试次数的重试策略</span><br><span class="line">3.RetryOneTime:仅重试一次</span><br><span class="line">4.RetryUntilElapsed:一直重试直到达到规定的时间</span><br></pre></td></tr></table></figure>
<p>代码示例：<a href="https://github.com/cnsyear/tuling-zookeeper.git" target="_blank" rel="noopener">https://github.com/cnsyear/tuling-zookeeper.git</a></p>

          
        
      
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<p>Redis开启远程访问</p>
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<li>修改redis.conf配置文件</li>
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">- 修改一 找到bind 127.0.0.1，把这行前面加个#注释掉</span><br><span class="line">- 再查找protected-mode yes 把yes修改为no，然后：wq保存文件</span><br><span class="line">- 服务关掉重新启动即可</span><br></pre></td></tr></table></figure>
<p>问题：如果还连接不上的话，可能是端口没有开放。<br>centos的firewall、iptable 没有打开6379端口，<br>阿里云服务器的话还有安骑士拦截，配置一下规则。</p>

          
        
      
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